Odds ratio

odds ratio

(Science: epidemiology) A comparison of the presence of a risk factor for disease in a sample of diseasedsubjects and non diseased controls. The number of people with disease who were exposed to a riskfactor ( I.e. ) over those with disease who were not exposed ( Io ) divided by those without disease who were exposed ( ne ) over those without who were not exposed ( no ). Thus OR=(I.e./Io)/(Ne/No)= I.e. No / Io Ne. This measure should be used for case control studies where we retrospectively look at risks in those with and without disease. Also known as exposure odds ratio.

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Genetic equilibrium means that the ratio of alleles is not changing between generations, but it has nothing to do with ... so we must use the allele frequencies of those populations to determine the odds. NOTE: probability grids only work when the two variables are independent of ...

... or mitochondrial to nucleic mammal. The mass-roosting and migration behavior is a very effective survival mechanism, as it decreases predation ... Such behaviour does not decrease predation rates it only enhances the odds that the individual will not be eaten. In fact, where huge food sources ...